Boring bar



March 11 1924. l,486,408

D. s. ANTHONY BORING BAR Filed JLklly 18. 1922 DAVE? S. ANTHONY. Gl? SAN NTGNO,

BOR-NG Application lcd July i8, 1.922.

To all w/zom if may concer-ii.'

it lmoivn that l. livin S. Aterno/nr, a

citizen o. the Unitec States, and a r sident ot San .ntoi io. in the county oj Bexar and State et Te-- .s have vented a cer `ain neiv and useful Boi ot which the iollov-.fing is a spewilication.

The object oit my invention is to provide a boring har oit simple, durable and inexpensive construction such as is designed to be used in connection '-.vith lathes tor boring the interior surfaces of tubular members or openings.

More particularly it is the object oit my invention to provide boring bar which may be easily and quickly clamped in position, and provided With a detachable and adjusta le cutting tool so that the bar may be constructed or coniparatively inexpensive material, and but a very small portion ot the tool steel need he used.

A, 'further object is to provide in such a boring` bar, improved means for clamping the tool in position.

A further object is to provide a boring oar which may be constructed ot comparatively inexpensive material, and having at each end detachable cutting tool, one ot the cutting tools being` adapted to be adjusted lateiuilly While the other one is adjustable longitudinally with the bar so the bar may be adapted to be used for a large variety ot Work.

further object is to provide a boring bar having a detachable cutting tool so constructed that the bar may be or" a maximum diameter to a given size cutting tool for the purposel ot sti-.Honing the same, that portion oi' the bar adjacent to the cutting tool being so constructed that the chips or cuttings may have suliicientroom to Work out ot' the opening when the inner tace of a comparatively small opening is being Worked upon by the tool.

rFliese and other objects will be apparent to those skilled in the art.

My invention consists in the construction, arrangement and combination of the various parts of the device, whereby the objects contemplated are attained, as hereinafter more Jullv set forth, pointed out in my claims, and illustrated in the accompanying drawings, in which:

Figure l is a side elevation of my improved boring bar showing it in operative relation With the inner surface of a casting, the said casting being shown in section.-

Serial No. 575,992.

Figure 2 is a detail, longitudinal, sectional vieiv 'taken on the line 2 2 of Figure l, with the cutting tool removed.

Figure 8 is an end elevation ot Figure l.

Figure e' is a perspective vieiv of the Wedge device Jfor securing one oit the cutting tools in position Figure 5 is a detail, transverse, sectional vieiv taken on the line 5 5 of Figure 2.

Figure 6 is a detail, bottom vieiv ot a right hand portion of the boring bar as shovvn in Figure l..

Figure 7 is a dota", sectional view taken on the line 7-7 or Figure 6.

My improved boring bar comprises a shaft 0 formed ot high grade steel, but inexpenive P tool steel and compared to the price or an be ot any desired length The said ai.' is provided at one end with a substantially square opening ll extending transversely through the bar, the inner tace l2 being tapered, as clearly shown in lligin'e T.

Extending longitudinally in the face ot the shaft 10 is a slot 13, one end ot' which communicates with the opening ll. The. opposite end oit the slot i3 is pr vided with a semi-circular lug lll so arranged as bo provide a curved slot l5. l

rlhc opening il is designed to receive a cutting tool 15a which is adiustably secured in the opening il by means ot a Wedge i6. This Wedge i6 is provided with tivo [langes at righ` angles to each other. Both of the flanges are Wedge shaped and designed to engage the faces l2.

@ne or the flanges 17 is provided with notch 18 which is designed to receive the outer end oit a spring 19, the inner end of which is designed to be drii en into the slot l5 so that the member 17 will be yieldingly held Within the opening l1 to hold the tool 15ZL in position, and so arranged that vibration or the tool l5a will not cause the said tool to become loose. The opposite vend et the shaft l0 is provided with a tapered portion 20, the circular end ot which is preferably arranged eccentric with the circumference ot the shaft 10, as clearly shown in Figures 3 and 5, so as to stiften the outer end of the bar against lateral moveA ment in one direction, and also to permit a comparatively short cutting tool to be used when small holes are being machined.

The outer end of the tapering portion 2O is provided with. a square hole 21, which ex tends longitudinally in the shaft 10, as clear ly shown in Figure 2. One or two sides of the opening 21 may have their outer ends beveled as indicated at 22 in Figure 2.

The opening 21 is designed to receive a Wedge block 23 having a Wedge shaped flange to fit the face 22 of the opening 21, the said tace being provided with a laterally extending flange 211. rllhe flange 24 may also be tapered it so desired. he Wedge being designed to longitudinally enter the opening- 21.

The outer end of the Wedge 24C is provided With a head 25 by Which the said Wed ge may be Withdrawn from the opening 2l, or replaced therein, by means of a special tool designed by me for that purpose.

rllhe top one oi" the faces of the head meniber 25 is provided With an opening 2ba which is for the purpose or receiving an operating pin ot the said Wrench or tool, 'for removing the Wedge, the tool not beingillustrated inasmuch as it is not a part of my present invention.

The opening 21 is designed to receive a tool 26 Which is preferably of the square type. These tools are constructed of very high grade tool steel anr are expensive to buy. The outer end of the tool 26 may be bent laterally, as illustrated in lligures 1 and 3, and given any desired shape, or the tool may be provided with a point entending longitudinally with the bar.

After the body portion or the tool has been inserted in the opening 21, the Wedge 23 is then placed in position and rigidly secured therein by means of a special Wrench made by me i'or that purpose.

By this arrangement, it will be seen tha the tool .vill be held hrmly Within the shaft 10. Considerable advantage is obtained by adjustably securing the tool 26 Within the sha'tt 10 due to the fact that as the tool is Worn away, it may be easily and quickly removed for sharpening and a new point formed thereon, as Will become necessary from time to time by bending the nevv cutting portion. rlhis may be easily and quichly done by an ordinary mechanic, While heretofore it has been customary to forni the main bar and tool of a single piece of rnaterial. rlhis required that the end of the bar be drawn to a taper and that the tool be formed on the tapering end. rllhe forging and sharpening` of this high carbon steel required an expert and Was quite expensive not only for the steel itself. but for the y amount of labor involved.

With my improved bar, a comparatively i. ,asenos long piece of tool steel may be inserted in the opening 21 and may be used up until a very short piece is lett, as the clamp 23 is arranged in the extreme outer end oi the shaft 10 to firmly and rigidly hold a coniparatively short steel Within the said hole. rlhe short piece that is lett may be used in the opening 11.

ln Figure 1, lhave illustrated the manner in which the tool 26 may be adapted to cut or ream a hole of small diameter compared with the size of the bar 10.

By providing the tapering Aportion 2O it Will be seen that suicient olea rance is provided tor the cuttings :"rom the tool 26; and furthermore by making the outer end of said tapering portion eccentric with he body portion, a very short tool may be used thereby permitting substantially allot the tool steel of a given piece to be used and at the same time strengthen the same on account of its short leverage.

llt will be easily seen that it would not be possible to use the tool l5 to cut nearly s small an opening as could be done with the tool 26, the tool 15 being provided for larger openings and heavier Work.

By this arrangement, it will be seen that either end may be used and either et the tools may be easily and quickly placed in position which Yis quite an important item in devices oi. this kind in order to save time.

Thus it vvill be seen that l have provided a boring bar of simple, durable and inexpensive construction, in Which the cost of sharpening the tools and the tool steel itself is very loiv, and so arranged that When the tools are placed in a cutting position, they will be rig'dly and firmly held in position against vibration and chattering.

l claim as my invention:

1. A. boring bar comprising shaft tapered at ene end, the said tapered end being provided with a longitudinal opening,

tool slidably mounted Within said opening, and a Wedge designed to move longitudinally Within the opening` to secure the tool therein.

2. A boring bar comprising a shaft hav- 

